Mining Stress Evolution Law of Inclined Backfilled Stopes Considering the Brittle-Ductile Transition in Deep Mining

Yuan Zhao, Guoyan Zhao, Jing Zhou, Xin Cai and Ju Ma
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Yuan Zhao: School of Resources and Safety Engineering, Central South University, Changsha 410083, China
Guoyan Zhao: School of Resources and Safety Engineering, Central South University, Changsha 410083, China
Jing Zhou: School of Resources and Safety Engineering, Central South University, Changsha 410083, China
Xin Cai: School of Resources and Safety Engineering, Central South University, Changsha 410083, China
Ju Ma: School of Resources and Safety Engineering, Central South University, Changsha 410083, China

Mathematics, 2022, vol. 10, issue 8, 1-22

Abstract: To study the mining stress evolution law of inclined backfilled stope in deep mining, this paper first proposes a method for determining the parameters of the brittle-ductile transition model corresponding to the Hoek–Brown criterion and Mohr-Coulomb criterion under high geostress. Then, a model composed of inclined backfilled stopes with different depths is established to simulate the sequential mining process of ore bodies with varying depths from shallow to deep. The numerical model’s stratum displacement, rock mass stress distribution, and risk factors show that the mining-induced stress will move to the upper stopes and the stratum below the deepest stope. The transfer range and influence degree of mining-induced stress will increase with the increase of the deep mining, resulting in the most dangerous backfilled stope occurring one to two layers above the deepest stope and the apparent stress concentration area occurring below the deepest stope. To prevent disasters caused by mining stress, pillars in inclined deep stopes should have large safety factors. Replacing low-strength backfills with high-strength backfills can reduce the stress concentration in the stratum below the deepest stope.

Keywords: deep mining; mining disturbance; stress evolution; brittle-ductile transition; backfilled stopes (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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